Chosen Solution
Anyone ever replace a logic board in one of these babies? Is the part even available?? Update (11/03/2022) Thanks everyone, especially @danj. I’m going to urge my client to get a new machine, as fixing this one is just too problematic for a 12+ year old iMac! Update (11/07/2022) Okay, so it turns out the client bought a new graphics card for this machine, and wants me to install it. Have any of you ever attempted this install, and if so, would you recommend I give it a try?? (Let me know if it would be better if I started a new thread on this.) Thanks, John
@macdoktor since the removal of the logic board is not listed in the guides I figure we can at least provide you with some written instructions Model A1312 2011 Disassembly. As for the logic board itself, there are three for this model/year 661-5948 2.7GHz 661-5949 3.1GHz 661-5950 3.4GHz If you do an online search by those numbers, you will find plenty of replacement boards available from lot’s of reliable vendors. Update (11/08/2022) @macdoktor since the removal of the video card is also not listed in the guides, we can at least provide you with some written instructions Video Card Removal Video card for this particular model are the: 661-5967 AMD Radeon HD6770 512 MB 661-5968 AMD Radeon HD6970 1GB 661-5969 AMD Radeon HD6970 1GB
I would start off checking the onboard diagnostics LED’s to what they are telling you. Locate the LED’s about midway on the logic board with the display disconnected what from left to right which ones are lit when you power the system and press the power button.
https://duckduckgo.com/y.js?ad_domain=eb… Here is a part
